Fifteen percent increase in number of civilian lives lost in coordinated attacks involving more than one perpetrator.

The UN has condemned an increase in civilian deaths in Afghanistan in the first half of 2017, with 1,662 killed and more than 3,500 injured.

Deaths and injuries from suicide bombings and other "complex attacks" rose 15 percent, according to a new report by the UN Assistance Mission in Afghanistan (UNAMA), which has been documenting civilian casualties in the war-torn country since 2009.

At least 40 percent of all civilian casualties were caused by anti-government forces, including the Taliban, and in attacks claimed by the Islamic State of Iraq and the Levant (ISIL) group, the report said.

"The human cost of this ugly war in Afghanistan - loss of life, destruction and immense suffering - is far too high," Tadamichi Yamamoto, the UN special envoy to Afghanistan, said in a statement.

"The continued use of indiscriminate, disproportionate and illegal improvised explosive devices is particularly appalling and must immediately stop."

In May, a truck bomb in the heart of the capital, Kabul, detonated by a suicide attacker, killed at least 92 people and wounded nearly 500 in what the UN called the "deadliest incident documented" since the international military intervention that toppled the Taliban in 2001.

No group claimed responsibility for the attack.

Deaths in the capital Kabul accounted for nearly 20 percent of the toll.